[PATCH] early_res: fix check in free_early_partial

[Adam Lackorzynski]

free_early_partial must check the returned region of find_overlapped_early()
whether it is a region at all. Otherwise the function will indefinitely
loop.

Signed-off-by: Adam Lackorzynski <adam@xxxxxxxxxxxxxxxxxxxx>
---
 kernel/early_res.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/early_res.c b/kernel/early_res.c
index 31aa933..9afcb4c 100644
--- a/kernel/early_res.c
+++ b/kernel/early_res.c
@@ -341,10 +341,11 @@ void __init free_early_partial(u64 start, u64 end)
 
 try_next:
 	i = find_overlapped_early(start, end);
-	if (i >= max_early_res)
+	r = &early_res[i];
+
+	if (i >= max_early_res || !r->end)
 		return;
 
-	r = &early_res[i];
 	/* hole ? */
 	if (r->end >= end && r->start <= start) {
 		drop_range_partial(i, start, end);
-- 
1.7.1
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